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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 13 
seeds in the affected compartment fail to develop and the lint does 
not expand upon the opening of the boll, remaining matted and 
presenting a slightly smutty appearance. 
Most of the cotton had been picked and it was impossible to get an 
estimate of the amount of damage caused by this insect, but it must 
have been appreciable, especially as the people were well aware of 
the damage. 
Only a few plants of tobacco were seen, these being in a garden at 
Triunfo, and upon these a weevil, determined by Mr. H. S. Barber as 
Trichobaris mucorea Lee., was fairly common, although it apparently 
did no damage. 
The citrus fruits are suprisingly free from pests, except for the red 
scale, Chrysomphalus aurantii (Maskell), which in some places is 
extremely bad. I saw also a small infestation of Lepidosaphes gloveri 
(Pack.), but beyond this no insects of any sort were seen on these 
hosts. 
The mango, which in other parts of the world is host to numerous 
insects is here for all practical purposes free from pests. Aside from 
a few specimens of Aspidiotus lataniae Sign., and an apparently native 
species of Asterolecanium, no scale insects were found upon it. A few 
specimens of a Thysanopteron, determined by Mr. A. C. Morgan as 
Heliothrips haemorrhoid alis (Bouche), which causes a silvering of the 
fruit and leaves, were taken from it at San Jose del Cabo. 
There are a number of scale insects on cultivated hosts, few of these 
of any importance. The black scale, Saissetia olece (Bern.) was seen, 
but was taken only from wild hosts and then in no numbers. What is 
probably Pseudococcus citri (Risso) (the specimens were lost) was 
seen on the fruit of mango at La Paz. Asterolecanium pustulans 
(Ckll.) is common on oleander. Aspidiotus diffinis Newstead was 
taken from guava at La Paz. Pseudoparlatoria parlatorioides (Comst.) 
was found in abundance on guava at San Jose del Cabo, avocado at 
Todos Santos and ornamental at La Paz. Pseudococcus maritimus 
(Ehrh.) was taken from a wild host at Cabo san Lucas but was not 
seen on cultivated hosts. An undetermined species of I eery a which I 
regard as I. rileyi Ckll., was found at San Jose del Cabo on numerous 
hosts. 
An aphid, determined by Mr. A. C. Baker as Aphis illinoisensis 
Shimer, was found on grape at Triunfo but was not abundant. 
A Tingid, determined by Mr. Carl J. Drake as Corythuca gossypii 
(Fabr.), was found in some numbers on castor bean at San Jose del 
Cabo. I was informed that the tomatoes here are at times lost by 
the ravages of what is apparently a Sphinx larva. A weevil has been 
taken from sweet potatoes at the same place but I saw no specimens. 
